Addicts suffering from water withdrawl often drink amounts that are unsafe for their health which is why marathon runners have to be given water adulterated with mind altering metals like sodium and highly toxic chlorine to make it safe for them to drink.
It's kind of insane that water addiction would drive people to ingest water in such vast amounts that you'd have to add chlorine and sodium to make it safer.
If you think places unsafe for swimming are marked I would hazard a guess that you haven't spent much time in the outdoors.
We talk about food addiction when people eat way too mcuh, not when people eat a proper amount to survive.